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katovenus [111]
4 years ago
13

Use the elimination method to solve the system of equations.

Mathematics
1 answer:
lora16 [44]4 years ago
4 0
5x + 2y = 7
-5x + 4y = 5

You can immediately eliminate the x-terms and subtract:

  2y = 7
  4y = 5
-_____
-2y = 2
   y = -1

Substitute back to find x:

-5x + 4y = 5
5x + 4(-1) = 5
5x - 4 = 5
5x = 9
x = 1.8

Finally, substitute back to check your work:

5x + 2y = 7  =>  5(1.8) + 2(-1) = 7  =>  9 - 2 = 7  <--True
-5x + 4y = 5  =>  -5(1.8) + 4(-1) = 5  =>  -9 - 4 = 5  <--False

Answer:
There is no solution.
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The graph of the equation xy=4 is symmetric with respect to which of the following?
inna [77]
The graph of x and y = 4 is symmetric with respect to the line x = y.
 Therefore, the answer is the second option shown above, which is:

 <span>the line y = x</span>
 
 Below is a graph where you can see the symmetry of xy = 4 with respect to the oblique axis x = y. This axis cuts the curves just at its apex

4 0
3 years ago
Pls help only b,d, and f
Leya [2.2K]
Solving for y right?

2y = 3x + 4 - x
2y = 2x + 4
y = 2x + 4 over 2
y = 2 (x + 2) over 2
y = x + 2


y - 3 = 2x - 6 over 2
y - 3 = 2(x - 3) over 2
y - 3 = x - 3
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x - y - 2 = 2(2x + 1)
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8 0
3 years ago
To increase the value of estimated Cohen's d, a researcher increases the sample size. Will this change the value of d?
tatyana61 [14]

Answer:

a. A) Yes; as sample size increases, effect size increases.

b. A) The critical value increases.

Step-by-step explanation:

a.

If all possible samples of size N are drawn from a finite population, Np, without replacement, and the standard deviation of the mean values of the sampling distribution of means is determined then:

σx =d  √N

d = σx . √N

d ∞ N

from this, we can say d is directly proportional to √N

where σx is the standard deviation of the sampling distribution of  means and d is the standard deviation of the population’. The standard deviation of a sampling distribution of mean values is called the standard error of the means,

therefore, we can conclude that:

A) Yes; as sample size increases, effect size increases.

b.

In this estimate, tc is called the confidence coefficient for small samples,  d is the standard deviation of the sample, x is the mean value of the sample and N is the number of members in the sample.

When determining the t-value, given by

t =( (x−µ) /s) * \sqrt{N-1}

it is necessary to know the sample parameters x and s and the population parameter µ. x and s can be calculated for the sample, but usually an estimate has to be made of the population mean µ, based on the sample mean value.

from the above equation it can be deduced that t value is determined with the sample size, and as the sample size increases

A) The critical value increases.

3 0
3 years ago
kaits younger sister is 2feet and 9 inches tall.katie is 5 feet and 4 inches tall . what is the difference between their two hig
Bess [88]

Answer:

2\ ft\ 7\ in

Step-by-step explanation:

we know that

To find the difference convert the dimensions to inches

Remember that

1\ ft=12\ in

so

katie's younger sister hight is

2\ ft\ 9\ in=2*12+9=33\ in

katie's hight is

5\ ft\ 4\ in=5*12+4=64\ in

Find the difference

64\ in-33\ in=31\ in

Convert to feet and inches

31\ in=31/12=(24/12)+(7/12)=2+(7/12)=2\ ft\ 7\ in

7 0
3 years ago
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